Recently, Sinopec Shanghai Petrochemical Co., Ltd. olefin new district fuel gas main pipe added a coalescer in this overhaul. The coalescer can filter all fuel gas entering the cracking furnace burner, eliminating dust and droplet entrainment, assisting cracking Low nitrogen emissions from the furnace. After the overhaul, the new fuel gas coalescing device will be put into use, marking the end of the ethylene cracking furnace renovation project for more than two years.
As early as 2016, Shanghai Petrochemical started the ethylene plant cracking furnace transformation project, and completed the 14-stage cracking furnace low-nitrogen combustion transformation before July 1, 2017, and CEMS (Fume Gas Online Analysis System) and Shanghai The Municipal Environmental Protection Bureau has networked and achieved the entire process of emission standards. This year, the company's olefins department began to carry out the follow-up technical transformation of the project.
After the convection section of the cracking furnace was modified to increase the heating area, and the fan was replaced simultaneously to improve the air suction capacity of the fan, the part effectively improved the heat absorption and smoke flow state of the convection section, and reduced the exhaust temperature of the convection section of the cracking furnace by about 20 °C. At the same time, the move also promoted the cracking load to reach the design value, reduced the oxygen content of the flue gas by about 2%, and improved the thermal efficiency by more than 1.5%.
On the other hand, in order to increase the amount of extra-high pressure steam generated in the cracking furnace, the ministry has replaced the quenching heat exchanger. Today, each cracking furnace can add up to 4 tons of ultra-high pressure steam per hour, adding a total of 16 tons per hour to the unit. Ultra-high pressure steam greatly reduces the impact of fluctuations in the amount of gas generated by the start-up boiler on the vapor balance of the ethylene plant.